Heating up XJ! Can't find problem.
Because you're getting ACTUAL numbers, the gauge in the cabin is not really that accurate...gives you a ballpark. Actual numbers are always better. Plus you get to see how the rad is performing, at the inlet and outlet. If it's spitting coolant, then yes, you're getting hot. This wasn't stated previously...but good to know.
At this point, I'm going to suggest that you remove the winch, and lightbar, and see what happens. Could very well be an airflow issue. Also have the coolant tested for exhaust gasses.
At this point, I'm going to suggest that you remove the winch, and lightbar, and see what happens. Could very well be an airflow issue. Also have the coolant tested for exhaust gasses.
::CF Administrator::





Joined: Feb 2011
Posts: 14,479
Likes: 805
From: Blunt, South Dakota
Year: 97
Model: Cherokee (XJ)
Engine: 4.6 stroker
Trying to give you low cost options first. Try removing the stuff on the bumper first...it's free, lol
Ok cool! Yea I will probably do that first as well! Lol
Banned
Joined: Feb 2014
Posts: 2,379
Likes: 18
From: Florida
Year: 2000
Model: Cherokee(XJ)
Engine: Golen 4.6L
You can:
There are other models as well. Many mechanics also have these kits and will test it for you either for free or for a small fee. If they want to charge you more than $5 or $10, just get your own and do it yourself.
Yes. The combustion leak tester tells you whether exhaust gas is spewing into your coolant through a cracked head, a leaking head gasket or a cracked block and boiling your coolant. That could explain your symptoms, but it's not a foregone conclusion. The test can just as easily help rule it out.
There are other models as well. Many mechanics also have these kits and will test it for you either for free or for a small fee. If they want to charge you more than $5 or $10, just get your own and do it yourself.
Yes. The combustion leak tester tells you whether exhaust gas is spewing into your coolant through a cracked head, a leaking head gasket or a cracked block and boiling your coolant. That could explain your symptoms, but it's not a foregone conclusion. The test can just as easily help rule it out.
Ok so, I bought the exhaust gas testing kit and tested it and it did not test positive for gasses in the cooling system. (SUCH a Relief!!) However I still have the overheating problem... I took off the front grille and touched both tranny coolers and the cooling hoses on one of them was significantly hotter than the other... Could this have something to do with it?
One of the "hints" I mentioned earlier that the PO mentioned was that he already had a slot in the cab where he was going to install a tranny temp. gauge. The tranny shift smoothly and doesn't slip or anything...
CF Veteran


Joined: Mar 2015
Posts: 1,203
Likes: 155
From: Northern CT
Year: 1995
Model: Cherokee
Engine: Turbo 4.0
So your problem persists with a new radiator, cap, and the radiator is unobstructed. Where is your trans kick down cable adjusted to? The trans cooler is a poor name for what it really is. It is more of a heat stabilizer and should never be removed from the system. The "cooler" is just a brass tube inside the radiator end cap. It is a fluid to fluid heat exchanger. Unless your trans is producing a crazy amount of heat it should not be able to exceed the cooling ability of the system. With your trans locked in OD it should make very little heat. Is your trans locking when you are cruising?
Last edited by Cummins93; Apr 8, 2016 at 02:02 PM. Reason: Quote fingers
So your problem persists with a new radiator, cap, and the radiator is unobstructed. Where is your trans kick down cable adjusted to? The trans cooler is a poor name for what it really is. It is more of a heat stabilizer and should never be removed from the system. The "cooler" is just a brass tube inside the radiator end cap. It is a fluid to fluid heat exchanger. Unless your trans is producing a crazy amount of heat it should not be able to exceed the cooling ability of the system. With your trans locked in OD it should make very little heat. Is your trans locking when you are cruising?
Just noticed that when the engine is warm, I'll take the radiator cap off and I get really small bubbles coming up to the top of the radiator opening. Also the coolant level will slowly rise until it starts spilling out of the radiator. Aren't these symptoms of a leakage?
CF Veteran


Joined: Mar 2015
Posts: 1,203
Likes: 155
From: Northern CT
Year: 1995
Model: Cherokee
Engine: Turbo 4.0
Bubbles on a cold start up is a hint of bad head to block seal or cracked head. How did you perform your block test? What is your trans kick down cable set at? Do you have an air compressor?
::CF Administrator::





Joined: Feb 2011
Posts: 14,479
Likes: 805
From: Blunt, South Dakota
Year: 97
Model: Cherokee (XJ)
Engine: 4.6 stroker
So your problem persists with a new radiator, cap, and the radiator is unobstructed. Where is your trans kick down cable adjusted to? The trans cooler is a poor name for what it really is. It is more of a heat stabilizer and should never be removed from the system. The "cooler" is just a brass tube inside the radiator end cap. It is a fluid to fluid heat exchanger. Unless your trans is producing a crazy amount of heat it should not be able to exceed the cooling ability of the system. With your trans locked in OD it should make very little heat. Is your trans locking when you are cruising?
Just noticed that when the engine is warm, I'll take the radiator cap off and I get really small bubbles coming up to the top of the radiator opening. Also the coolant level will slowly rise until it starts spilling out of the radiator. Aren't these symptoms of a leakage?
Second, the fluid rises because when you add heat, things expand. With the cap on, the system gets pressurized. Without it, you're just gonna puke coolant everywhere.
CF Veteran


Joined: Mar 2015
Posts: 1,203
Likes: 155
From: Northern CT
Year: 1995
Model: Cherokee
Engine: Turbo 4.0



